CBSE 12th

Yes, your percentage are good enough to get admission here. you can apply for admission you will get admission.
Good luck.

MBA is a post graduate programme. So, you first need to complete your graduation and then look for admission in MBA in Aviation. Since you are interested in Aviation you could also explore B.Sc. in Aviation & then go beyond.

All these domains are great and have excellent career prospects in future. So, choose according to your interest and passion. Choose that branch which you like and understand the most. Go into that branch which you know the basics and have passion and determination for. And in your heart you know that you will achieve greatness in this field. Institutions that offer good Quality engineering courses are:-
BITS Pilani
Lovely professional university
PSG Technology Coimbatore
National Institute of Engineering, Mysore
BIT Ranchi.

The fee generally varies for different students depending on their credentials. Please consult the hall of admissions once to get a better idea.

There is a low chance of getting a seat. However, once in pass you can consult the management for a management seat.

You need to see both of them are different, MCA will lead your career in computer application, MBA in management, and both have different requirement for minimum percentage. For MBA, you have to go through Test and Interview. Unless you don't pursue it from top universities it will be of very less use. You can try in Amity University, Lovely Professional University, Chandigarh University, and Symbiosis University. Please do check if you are ready for technical career or not.

That doesn't matter. B Tech degree is also an eligibility criteria for taking admission in reputed institutes. The thing that netters is your performance in GATE exam. Good luck.

Hi Soumya,
Yes, you can apply as its diploma course and you have to tell the college authorities about your class 12 so that you can make them assurance that you will clear or else they will put you as a lateral entry.